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What is Selenium?

Selenium automates browsers. That's it! What you do with that power is entirely up to you. Primarily, it is for automating web applications for testing purposes, but is certainly not limited to just that. Boring web-based administration tasks can (and should!) also be automated as well.

Selenium has the support of some of the largest browser vendors who have taken (or are taking) steps to make Selenium a native part of their browser. It is also the core technology in countless other browser automation tools, APIs and frameworks.

Which part of Selenium is appropriate for me?

If you want to

create quick bug reproduction scripts

create scripts to aid in automation-aided exploratory testing

Then you want to use Selenium IDE; a Firefox add-on that will do simple record-and-playback of interactions with the browser.

If you want to

create robust, browser-based regression automation

scale and distribute scripts across many environments

Then you want to use Selenium WebDriver; a collection of language
specific bindings to drive a browser -- the way it is meant to be driven.

Selenium WebDriver is the successor of Selenium Remote Control
which has been officially deprecated. The Selenium Server (used by both WebDriver and Remote Control)
now also includes built-in grid capabilities.

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